<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            background-color: lightseagreen !important;
        }
        #d1{
            background-color: lightcoral;

        }
        a{
            text-decoration: none;
        }
    </style>
</head>
<body>
<div id="d1">
    <p>这是P</p>
    <span>
        这是span
    </span>
    <a href="#">这是a</a>
</div>
</body>
</html>